ACh receptor subtypes include:
A. Adrenergic and noradrenergic
B. Nicotinic and muscarinic
C. Alpha and beta
D. Alpha and gamma
E. None of the above
ANS: B
Rationale: Receptors that bind ACh fall into two categories: nicotinic and muscarinic. These receptors are distinguished by their ability to bind certain drugs. Nicotine, derived from tobacco, selectively activates the nicotinic receptors. Muscarine, a poison derived from mushrooms, activates only the muscarinic receptors.
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Indicate whether the statement is true or false